Centralise message sending logic in one method, remove sendTTSMessage, add client shortcut in RESTMethods (#1031)

* start wip rewrite of sending/editing messages

* pass the build, modify the edit method to fit the new system

* simplify the applyToClass method

* change handling of file options

* add back message splitting

* i couldn't help myself

* add some smart message options

* clean up, add sexy options

* fix indentation

* fix up splitting

* add \b

* add back old methods for hydar happiness

* clean up more

* move code handling to the rest method

* clean up this.rest.client

* Update TextBasedChannel.js

* add docs back for the bad methods

* fix reply in group dms

* srsly gawdl3y

* make code better

* fix changes for gawdl3y

* fix checking

* remove getter

* make code handling more robust

* k

* fix up sendEmbed docs

* stupid

* fix up more docs because aaaaa

* no more pls

src/structures/GuildMember.js

@@ -430,8 +430,8 @@ class GuildMember {
   }
 
   // These are here only for documentation purposes - they are implemented by TextBasedChannel
+  send() { return; }
   sendMessage() { return; }
-  sendTTSMessage() { return; }
   sendEmbed() { return; }
   sendFile() { return; }
   sendCode() { return; }